The National Construction Code 2019 have adopted calculable indices, such as Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) to determine thermal comfort. These useful approaches enable us to undertake building user comparisons that apply to the majority of people and statistically predict the number of individuals who would express dissatisfaction with certain interior conditions.
One of the inputs for thermal comfort is Clothing (Clo). As clothing forms a thermal barrier that creates a layer of trapped body heat between the skin and the clothing, it is often found that multiple assumptions are needed on a seasonal basis in order to represent occupants annually.
To avoid making multiple assumptions on clothing, Speckel enables an adjusted calculation using the "Dynamic Clothing Model for ASHRAE 55". Simply, It enables designers to vary the clothing rate assumed seasonally based on the external temperature at 6 am, so that only one simulation for comfort is needed.